There was a time, not too long ago, when Bob Barr could have played spoiler. He was taking enough GA voters that McCain would lose the state to Obama. Some of that has turned around since Palin was added to the ticket.
Today, Bob Barr filed suit against Obama and McCain in Texas, accusing them of missing the filing deadline. This is going to be interesting. Texas has 34 electoral votes and McCain holds a solid 20 point lead there.